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Goodwill Schedule of Goodwill Allocated to Reporting Segments (Tables)
 6 Months Ended
Jun. 30, 2014
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
The following table reflects goodwill allocated to each reporting segment as of June 30, 2014:

 
Electricity
 
Gas
 
Water
 
Total Company
 
(in thousands)
Balance at January 1, 2014
 
 
 
 
 
 
 
Goodwill before impairment
$
493,610

 
$
394,878

 
$
429,783

 
$
1,318,271

Accumulated impairment losses
(433,378
)
 
—

 
(336,315
)
 
(769,693
)
Goodwill, net
60,232

 
394,878

 
93,468

 
548,578

 
 
 
 
 
 
 
 
Goodwill impairment
(977
)
 
—

 
—

 
(977
)
Effect of change in exchange rates
(434
)
 
(4,613
)
 
(1,015
)
 
(6,062
)
 
 
 
 
 
 
 
 
Balance at June 30, 2014
 
 
 
 
 
 
 
Goodwill before impairment
487,903

 
390,265

 
423,604

 
1,301,772

Accumulated impairment losses
(429,082
)
 
—

 
(331,151
)
 
(760,233
)
Goodwill, net
$
58,821

 
$
390,265

 
$
92,453

 
$
541,539